Comparison of Modulation Techniques for a Single-Phase Full-Bridge Photovoltaic Micro-Inverter Considering Reactive Power Capability

verfasst von

Tobias Brinker, Lennart Hoffmann, Jens Friebe

Abstract

In single-phase photovoltaic (PV) power systems, parasitic module capacitances are a well-known issue, as these create a path for high-frequency leakage currents, which can cause electromagnetic interference (EMI) problems. A common method to achieve a limitation of these currents is the harmonization of the common-mode (cm) voltages generated by the modulation of the inverter. The objective of this paper is to provide an overview of the switching states and corresponding cm-voltage waveforms of unipolar modulation techniques for full-bridge (FB) inverters and to identify advantageous modulation schemes. The reactive power switching states are also considered. For the investigations, a modified output filter is used. Further optimization using symmetric half-bridges and asymmetric half-bridges, utilizing two different types of wide bandgap transistors, are discussed in terms of thermal performance and parasitic switching node capacitances. Inverter prototypes of both variants are used for verification and performance analysis.

Organisationseinheit(en)

Institut für Antriebssysteme und Leistungselektronik

Typ

Aufsatz in Konferenzband

Seiten

841-846

Anzahl der Seiten

6

Publikationsdatum

2021

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Erneuerbare Energien, Nachhaltigkeit und Umwelt, Energieanlagenbau und Kraftwerkstechnik, Elektrotechnik und Elektronik

Ziele für nachhaltige Entwicklung

SDG 7 – Erschwingliche und saubere Energie

Elektronische Version(en)

https://doi.org/10.1109/ecce47101.2021.9595845 (Zugang: Geschlossen)